.page-contact{
  --c-line: rgba(233,226,203,.18);
  --c-line-soft: rgba(233,226,203,.09);
  --c-text-dim: rgba(233,226,203,.74);
  display: block;
  background: var(--ink);
  color: var(--paper);
  padding-bottom: clamp(32px,5vw,64px);
}

.page-contact .breadcrumb{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: clamp(18px,2.6vw,30px) 0 clamp(20px,3vw,32px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--steel);
}
.page-contact .breadcrumb a{
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .18s ease, color .18s ease;
}
.page-contact .breadcrumb a:hover{
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}
.page-contact .breadcrumb-sep{ color: rgba(233,226,203,.3); }
.page-contact .breadcrumb [aria-current="page"]{ color: var(--gold); }

.page-contact .contact-hero{
  max-width: 880px;
  margin-bottom: clamp(24px,3.6vw,44px);
}
.page-contact .contact-hero .eyebrow{
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--signal);
}
.page-contact .contact-hero h1{
  margin: 0;
  font-size: clamp(29px,5.2vw,52px);
  line-height: 1.08;
  letter-spacing: -.02em;
  font-weight: 800;
}
.page-contact .contact-hero .lede{
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: clamp(15px,1.6vw,17px);
  line-height: 1.65;
  color: var(--c-text-dim);
}

/* 首屏：左侧控制台状态卡 + 右侧反馈准备面板 */
.page-contact .contact-console{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: clamp(14px,2.4vw,24px);
}

.page-contact .contact-card{
  position: relative;
  overflow: hidden;
  border: 1px solid var(--c-line);
  background: var(--ink-3);
}
.page-contact .contact-card::before{
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, var(--grid-faint) 0 1px, transparent 1px 26px),
    repeating-linear-gradient(90deg, var(--grid-faint) 0 1px, transparent 1px 26px);
  pointer-events: none;
  z-index: 2;
}
.page-contact .contact-card-bg{
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .26;
  filter: grayscale(.45) contrast(1.08);
  z-index: 0;
}
.page-contact .contact-card-inner{
  position: relative;
  z-index: 1;
  padding: clamp(20px,3.2vw,40px);
  background: linear-gradient(155deg, rgba(11,31,26,.94) 0%, rgba(16,42,35,.86) 52%, rgba(7,21,16,.95) 100%);
}
.page-contact .contact-card-inner .tag{
  display: inline-block;
  margin: 0;
  padding: 4px 9px;
  border: 1px solid rgba(57,242,208,.42);
  color: var(--cyan);
  background: rgba(57,242,208,.08);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  border-radius: 0;
}
.page-contact .contact-mail{
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(18px,3.4vw,33px);
  line-height: 1.2;
  letter-spacing: -.015em;
  font-weight: 700;
  color: var(--gold);
  overflow-wrap: anywhere;
}
.page-contact .contact-actions{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}
.page-contact .copy-btn{
  appearance: none;
  cursor: pointer;
  border: 1px solid rgba(233,226,203,.34);
  background: transparent;
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  padding: 11px 16px;
  border-radius: 0;
  transition: border-color .18s ease, color .18s ease, background .18s ease;
}
.page-contact .copy-btn:hover{
  border-color: var(--cyan);
  color: var(--cyan);
}
.page-contact .copy-btn[data-copied="true"]{
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(57,242,208,.1);
}
.page-contact .contact-lines{
  margin: clamp(20px,3vw,30px) 0 0;
  padding: 0;
  border-top: 1px solid var(--c-line);
}
.page-contact .contact-line{
  display: grid;
  gap: 4px;
  padding: 13px 0;
  border-bottom: 1px solid var(--c-line-soft);
}
.page-contact .contact-line dt{
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--steel);
}
.page-contact .contact-line dd{
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
}

.page-contact .prepare{
  background: var(--paper);
  color: var(--brown);
  border: 1px solid var(--paper-2);
  padding: clamp(20px,3.2vw,36px);
}
.page-contact .prepare-kicker{
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--signal);
}
.page-contact .prepare h2{
  margin: 0 0 18px;
  font-size: clamp(19px,2.6vw,25px);
  line-height: 1.25;
  letter-spacing: -.01em;
  font-weight: 800;
  color: var(--brown);
}
.page-contact .checklist{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 15px;
}
.page-contact .checklist li{
  display: grid;
  grid-template-columns: 15px minmax(0,1fr);
  gap: 12px;
}
.page-contact .checklist li::before{
  content: "";
  width: 13px;
  height: 13px;
  margin-top: 4px;
  border: 1.5px solid var(--brown);
  background: rgba(36,26,18,.06);
}
.page-contact .checklist h3{
  margin: 0 0 3px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -.005em;
  color: var(--brown);
}
.page-contact .checklist p{
  margin: 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: rgba(36,26,18,.78);
}
.page-contact .prepare-note{
  margin: 20px 0 0;
  padding-top: 14px;
  border-top: 1px solid rgba(36,26,18,.18);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: rgba(36,26,18,.66);
}

/* 编号章节 */
.page-contact .chapter{
  padding: clamp(30px,4.6vw,60px) 0;
  border-top: 1px solid var(--c-line);
  margin-top: clamp(28px,4vw,54px);
}
.page-contact .section-head{
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: clamp(14px,2.2vw,24px);
}
.page-contact .num{
  font-family: var(--font-mono);
  font-size: clamp(26px,4vw,44px);
  line-height: .95;
  font-weight: 700;
  color: var(--signal);
  letter-spacing: -.02em;
}
.page-contact .section-title{
  margin: 0;
  font-size: clamp(20px,3vw,30px);
  line-height: 1.2;
  letter-spacing: -.015em;
  font-weight: 800;
}
.page-contact .chapter-lede{
  margin: 0 0 clamp(18px,2.6vw,26px);
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.66;
  color: var(--c-text-dim);
}
.page-contact .chapter-grid{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: clamp(18px,2.6vw,34px);
}
.page-contact .chapter-body p{
  margin: 0 0 18px;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.66;
  color: var(--c-text-dim);
}

.page-contact .issue-list{
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--c-line);
}
.page-contact .issue-list li{
  display: grid;
  grid-template-columns: 26px minmax(0,1fr);
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--c-line-soft);
}
.page-contact .issue-kicker{
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--signal);
  padding-top: 3px;
}
.page-contact .issue-list h3{
  margin: 0 0 5px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -.005em;
}
.page-contact .issue-list p{
  margin: 0;
  font-size: 14px;
  line-height: 1.62;
  color: rgba(233,226,203,.68);
}

.page-contact .chapter-aside{
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--cyan);
  background: rgba(16,42,35,.6);
  padding: clamp(16px,2.4vw,22px);
  align-self: start;
}
.page-contact .aside-label{
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}
.page-contact .chapter-aside p{
  margin: 0;
  font-size: 14px;
  line-height: 1.66;
  color: var(--c-text-dim);
}
.page-contact .chapter-aside strong{
  color: var(--paper);
  font-weight: 700;
}
.page-contact .aside-links{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}
.page-contact .aside-links a{
  display: inline-block;
  padding: 8px 13px;
  border: 1px solid rgba(57,242,208,.4);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  text-decoration: none;
  transition: background .18s ease, border-color .18s ease;
}
.page-contact .aside-links a:hover{
  background: rgba(57,242,208,.12);
  border-color: var(--cyan);
}

/* 合作方向 */
.page-contact .coop-list{
  border-top: 1px solid var(--c-line);
}
.page-contact .coop{
  border-bottom: 1px solid var(--c-line-soft);
}
.page-contact .coop[open]{
  background: rgba(233,226,203,.035);
}
.page-contact .coop summary{
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 4px;
  font-size: 15.5px;
  font-weight: 700;
  letter-spacing: -.005em;
  color: var(--paper);
}
.page-contact .coop summary::-webkit-details-marker{ display: none; }
.page-contact .coop summary::after{
  content: "+";
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--cyan);
  flex: none;
}
.page-contact .coop[open] summary::after{
  content: "–";
}
.page-contact .coop-body{
  padding: 0 4px 16px;
}
.page-contact .coop-body p{
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.62;
  color: var(--c-text-dim);
}
.page-contact .coop-need{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 7px;
}
.page-contact .coop-need li{
  position: relative;
  padding-left: 16px;
  font-size: 13.5px;
  line-height: 1.55;
  color: rgba(233,226,203,.62);
}
.page-contact .coop-need li::before{
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background: var(--gold);
}

.page-contact .partner-media{
  border: 1px solid var(--c-line);
  background: var(--ink-3);
  padding: 0;
  align-self: start;
}
.page-contact .partner-media img{
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  filter: grayscale(.4) contrast(1.06);
}
.page-contact .media-caption{
  margin: 0;
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: .05em;
  color: var(--steel);
  border-top: 1px solid var(--c-line-soft);
}

/* 响应节奏 */
.page-contact .steps{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}
.page-contact .steps li{
  position: relative;
  padding: 0 0 0 18px;
  border-left: 1px solid var(--c-line);
}
.page-contact .steps li::before{
  content: "";
  position: absolute;
  left: -3.5px;
  top: 6px;
  width: 6px;
  height: 6px;
  background: var(--cyan);
}
.page-contact .step-num{
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--steel);
}
.page-contact .steps h3{
  margin: 0 0 5px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -.005em;
}
.page-contact .steps p{
  margin: 0;
  font-size: 14px;
  line-height: 1.62;
  color: rgba(233,226,203,.68);
}

/* 收尾 */
.page-contact .contact-tail{
  margin-top: clamp(28px,4vw,52px);
  padding: clamp(20px,3vw,34px);
  border: 1px solid var(--c-line);
  background: linear-gradient(120deg, var(--ink-2), var(--ink));
  display: grid;
  gap: 16px;
}
.page-contact .contact-tail p{
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.66;
  color: var(--c-text-dim);
}
.page-contact .tail-actions{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-contact .tail-fine{
  font-size: 13px;
  line-height: 1.6;
  color: rgba(233,226,203,.56);
}
.page-contact .tail-fine a{
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(57,242,208,.4);
}
.page-contact .tail-fine a:hover{
  border-bottom-color: var(--cyan);
}

.page-contact .contact-filing{
  margin: clamp(20px,3vw,32px) 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--steel);
}

@media (min-width: 640px){
  .page-contact .steps{
    grid-template-columns: repeat(2, minmax(0,1fr));
    gap: 16px 18px;
  }
}

@media (min-width: 900px){
  .page-contact .contact-console{
    grid-template-columns: minmax(0,7fr) minmax(0,5fr);
    align-items: stretch;
  }
  .page-contact .prepare{
    display: flex;
    flex-direction: column;
  }
  .page-contact .chapter-grid{
    grid-template-columns: minmax(0,7fr) minmax(0,5fr);
  }
  .page-contact .coop-list{
    padding-right: 8px;
  }
  .page-contact .steps{
    grid-template-columns: repeat(4, minmax(0,1fr));
    gap: 0;
  }
  .page-contact .steps li{
    padding: 26px 22px 0 0;
    border-left: 0;
    border-top: 1px solid var(--c-line);
  }
  .page-contact .steps li::before{
    left: 0;
    top: -3.5px;
    width: 7px;
    height: 7px;
  }
}

@media (min-width: 1100px){
  .page-contact .section-head{
    gap: 20px;
  }
  .page-contact .contact-tail{
    grid-template-columns: minmax(0,1fr) auto;
    align-items: center;
  }
  .page-contact .tail-fine{
    grid-column: 1 / -1;
  }
}
<<<END>>>
```